EXPLAINER: NFL using helmet caps for player safety, research
Guardian Cap debuts during minicamps in effort to reduce avoidable
More padding the issue of concussions and better helmets
At training camp, extra helmet padding is designed to reduce head
Guardian Caps are the latest effort to address CTE, football
Guardian Caps: NFL requires use of helmet cover at training camps
NFL hopes to reduce head injuries with helmet experiment – The
What are NFL players wearing on their helmets at training camp and
NFL hopes to reduce head injuries with helmet experiment